patch: Added support for passing params as keyword arg

[MateuszOssGit]

Added support for passing params as keyword arg

• init:

  chat = ChatWatsonx(
  model_id=MODEL_ID_TOOL,
  url=URL,
  project_id=WX_PROJECT_ID,
  max_tokens=10
  )

• method:

  resp_1 = chat.invoke(prompt_1, max_tokens=10)

[MateuszOssGit]

Integration test passing successfully -> https://github.com/langchain-ai/langchain-ibm/actions/runs/11741957098